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There will be 2 cohorts in this study, each consisting of Part A and Part B.

The primary objectives of Cohort 1 are to evaluate the steady state pharmacokinetics (PK) for elvitegravir (EVG) and tenofovir alafenamide (TAF) and confirm the dose of the elvitegravir/cobicistat/emtricitabine/tenofovir alafenamide (E/C/F/TAF) single tablet regimen (STR) (Part A) and to evaluate the safety and tolerability of E/C/F/TAF STR through Week 24 (Part B) in HIV-1 infected, antiretroviral (ARV) treatment-naive adolescents.

The primary objectives of Cohort 2 are to evaluate the PK of EVG and TAF in virologically suppressed HIV-1 infected children 6 to < 12 years of age weighing ≥ 25 kg administered E/C/F/TAF STR (Part A) and to evaluate the safety and tolerability of E/C/F/TAF STR through Week 24 in virologically suppressed HIV-1 infected children 6 to < 12 years of age weighing ≥ 25 kg.

A Phase 2/3, Open-Label Study of the Pharmacokinetics, Safety, and Antiviral Activity of the Elvitegravir/Cobicistat/Emtricitabine/Tenofovir Alafenamide (E/C/F/TAF) Single Tablet Regimen (STR) in HIV-1 Infected Antiretroviral Treatment-Naive Adolescents and Virologically Suppressed Children

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No prior use of any approved or experimental anti-HIV-1 drug for any length of time

Cohort 2

6 years to < 12 years of age at baseline

Weight greater than or equal to 25 kg (55 lbs)

Plasma HIV-1 RNA of < 50 copies/mL (or undetectable HIV-1 RNA level according to the local assay being used if the limit of detection is > 50 copies/mL) for ≥ 180 consecutive days (6 months) prior to screening on a stable antiretroviral regimen, without documented history of resistance to any component of E/C/F/TAF STR.

Key Exclusion Criteria:

Hepatitis B or hepatitis C virus infection

Evidence of active pulmonary or extra-pulmonary tuberculosis disease within 3 months of the screening visit.